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| 1 | 基于近场动力学理论的混凝土重力坝地震响应数值模拟显示文摘近场动力学基于非局部作用思想直接求解积分形式的运动方程,避免了传统的局部微分方程求解不连续问题时的奇异性,可以有效地求解连续和非连续变形问题,在众多领域已得到成功应用。本文建立了混凝土重力坝地震动力响应的键基近场动力学模型,采用FORTRAN90语言编程实现,并通过在三层虚拟节点施加地震加速度实现了地震波的输入。首先通过悬臂梁自由端受力和底部周期运动时的动力响应两个算例验证了模型和程序的精度和有效性,最后基于本文模型对混凝土重力坝的地震动力响应进行了数值模拟。结果表明:本文建立的键基近场动力学模型可以较好的模拟混凝土重力坝的地震动力响应,为混凝土坝地震动力响应数值模拟方法提供了一种新的思路和方法。 | 赵凯丽 邱流潮 李敬军 | 2021 | 中国农村水利水电2021，，7： | 1 |
| 2 | Bond-associated non-ordinary state-based peridynamic model for multiple spalling simulation of concrete显示文摘The non-ordinary state-based peridynamic(NOSB PD)model has the capability of incorporating existing constitutive relationships in the classical continuum mechanics.In the present work,we first develop an NOSB PD model corresponding to the Johnson–Holmquist II(JH-2)constitutive damage model,which can describe the severe damage of concrete under intense impact compression.Besides,the numerical oscillation problem of the NOSB PD caused by zero-energy mode is analyzed and hence a bond-associated non-ordinary state-based peridynamic(BA-NOSB PD)model is adopted to remove the oscillation.Then,the elastic deformation of a three-dimensional bar is analyzed to verify the capability of BA-NOSB PD in eliminating the numerical oscillation.Furthermore,concrete spalling caused by the interaction of incident compression wave and reflected tension wave is simulated.The dynamic tensile fracture process of concrete multiple spalling is accurately reproduced for several examples according to the spalling number and spalling thickness analysis,illustrating the approach can well simulate and analyze the concrete spalling discontinuities. | Siyang Yang Xin Gu Qing Zhang Xiaozhou Xia | 2021 | Acta Mechanica Sinica2021，37，7： | 0 |
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